The '+' Polarity Symbol Dimensions
Printed From: PCB Libraries Forum
Category: PCB Footprint Expert
Forum Name: Questions & Answers
Forum Description: issues and technical support
URL: https://www.PCBLibraries.com/forum/forum_posts.asp?TID=3539
Printed Date: 16 Sep 2025 at 2:44am
Topic: The '+' Polarity Symbol Dimensions
Posted By: m.elsayed
Subject: The '+' Polarity Symbol Dimensions
Date Posted: 14 Sep 2025 at 6:58am
|
I have '+' polarity marker in Silkscreen and Assembly layers with same dimension as line width = 0.05 mm and size = 1.016 mm However, when open in Altium Designer the '+' symbol has different dimension values. Footprint Expert:  Altium Assembly:  Silkscreen:  |
Replies:
Posted By: tgrodnicki
Date Posted: 14 Sep 2025 at 11:22pm
|
Footprint Expert reports the length of the lines forming the cross as the maximum value. Most CAD programs do not account for round ends when reporting the length of the lines. If you subtract the width (0.050) from the length reported by Footprint Expert (1.016), you get the result reported by Altium Designer (0.966).
|
Posted By: m.elsayed
Date Posted: 15 Sep 2025 at 5:51am
|
But also, I found in line width changed to 0.254 mm other layer assembly. However, I changed the line width to 0.05 mm. |
Posted By: Tom H
Date Posted: 15 Sep 2025 at 3:25pm
|
I created a Silkscreen Plus + symbol in Footprint Expert 1.00 mm X 0.15 mm line width. Here is the Footprint Expert Symbol dialog box:  I translated the footprint to Altium and here are the Plus Symbol dimensions.  Here is the Altium Properties for the Polarity Marker:  It seems to be working 100% correct. Can you confirm that the issue you reported is working correctly? ------------- Stay connected - follow us! https://twitter.com/PCBLibraries" rel="nofollow - X - http://www.linkedin.com/company/pcb-libraries-inc-/" rel="nofollow - LinkedIn |
Posted By: m.elsayed
Date Posted: 16 Sep 2025 at 2:20am
|
Thanks Tom, for your great support I have get your point in length, but for line width i notice below:- 1-Silkscreen however i have selected value line width =0.05 mm and select Apply & Done, a  and then checked found it 0.15 mm (PCb tool)  2-Assembly however i select 0.05 mm in line width  i found it in altium as 0.025 mm  please can check and have explanation what happen and causes for this
|